Catalytic cracking (FCC) increases

gasoline yield from heavy gas oil

octane number of naphtha via isomerization and dehydrogenation

Hydrotreating removes

sulfur, nitrogen and metals using H2

Petroleum Refining and Petrochemicals MCQs 2026

5 questions with detailed answers · 5 from past papers · 1 quiz batches available

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Page 1 of 1Questions 1–10 of 5

Q1Past Paper · PPSC/FPSC/CSSmedium
Catalytic cracking (FCC) increases
1. Aasphalt only without conversion
2. Bcoke zero always
3. Cmethane only
4. Dgasoline yield from heavy gas oil
💡 Explanation:
Carbon rejection as coke on catalyst.
Q2Past Paper · PPSC/FPSC/CSSeasy
Atmospheric distillation column top product is typically
1. Avacuum residue only
2. Blight naphtha and gases
3. Ccoke only
4. Dlubricating oil only
💡 Explanation:
Light ends taken overhead.
Q3Past Paper · PPSC/FPSC/CSSmedium
Reforming improves
1. Apour point of wax only
2. Boctane number of naphtha via isomerization and dehydrogenation
3. Cash in coal
4. Dconcrete strength
💡 Explanation:
Platinum catalyst reforming.
Q4Past Paper · PPSC/FPSC/CSSmedium
Hydrotreating removes
1. Aonly sodium chloride from drinking water
2. Bonly CO2 from flue gas post-combustion only here
3. Conly sand from river
4. Dsulfur, nitrogen and metals using H2
💡 Explanation:
HDS on catalyst.
Q5Past Paper · PPSC/FPSC/CSSeasy
API gravity of crude oil is
1. Ahigher for heavier crude always
2. Bindependent of composition
3. Chigher for lighter crude
4. Dequal to viscosity
💡 Explanation:
API = (141.5/SG) − 131.5.

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Petroleum Refining and Petrochemicals MCQs 2026

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